Any help is appreciated for the unanswered questions

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

Which expression converts 45 degree to radians

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²